Quantitative Method of Aggregate Spalling Degree of Chip Seal in Three Dimension

doi:10.12141/j.issn.1000-565X.240152

Abstract

Abstract:

In order to accurately quantify aggregate loss in chip seals and address the limitations of traditional methods that overlook the shape and orientation of chip seals, this study utilized indoor 3D laser scanning equipment to capture point cloud data of chip seals before and after stripping. By introducing the minimum intra-class variance, the elevation segmentation threshold was determined, allowing for the spatial stripping contours. This enables the calculation of stripping area indicators and provides the error distribution of the laser method for measu-ring stripping areas. Individual stripped aggregates were reassembled, and the stripping mass and stripping area indicators for each stripped region were compared. Additionally, the AIMS-Ⅱ system was employed to examine the shape characteristics of the spalling aggregates. The results demonstrated the mean relative error for 75 stripping area samples was 4.07%, indicating high detection accuracy. The standard deviation of the spalling area calculation ranged from 1.73 to 3.89, confirming the good detection stability. A comparison of the mass loss and spalling area of each spalling region revealed a general trend of increasing mass loss with increasing spalling area; however, discrepancies were observed where increased spalling area corresponded to decreased mass loss. Shape analysis using AIMS-II indicated that flaky aggregates tend to have large spalling areas but small masses, whereas needle-like aggregates typically have large mass loss but small spalling areas.

Key words: road engineering, chip seal, 3D laser, aggregate spalling, spalling area

CLC Number:

U418.6

ZHANG Yandi, HUI Bing, MA Ziye, LI Yuanle, WANG Hainian. Quantitative Method of Aggregate Spalling Degree of Chip Seal in Three Dimension[J]. Journal of South China University of Technology(Natural Science Edition), 2025, 53(2): 80-91.

Figures/Tables 17

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指标		数值
指标		SBS改性沥青	技术要求
针入度（25 ℃）/（10^-1 mm）		67.7	60~80
软化点/℃		71.8	≥55
延度（5 ℃）/cm		43.2	≥30
闪点/℃		328	≥230
RTFO试验（163 ℃，85 min）	质量变化/%	0.07	≤ ± 1.0
	残留针入度（25 ℃）/%	78.8	≥60
	延度（5 ℃）/cm	21	≥20

指标	相对密度/（g·cm^-3）			压碎值/%	洛杉矶磨耗损失/%
指标	表观	表干	毛体积	压碎值/%	洛杉矶磨耗损失/%
测试值	2.690	2.651	2.621	13.28	16.31
规范要求	—	—	—	≤ 28	≤ 30

区域	1#试件						区域	2#试件						区域	3#试件
区域	S₁	S₂	S₃	S₄	S₅		区域	S₁	S₂	S₃	S₄	S₅		区域	S₁	S₂	S₃	S₄	S₅
A₁	11.3	3.2	14.5	1.9	10.6	B₁		52.3	55.6	52.5	50.7	51.2	C₁		7.5	1.2	0.0	0.0	11.9
A₂	20.1	17.5	19.4	23.5	17.8	B₂		97.1	100.9	98.7	93.5	96.4	C₂		16.1	11.6	1.3	13.3	9.5
A₃	24.2	8.6	18.6	24.6	18.8	B₃		100.2	107.5	99.6	101.5	103.1	C₃		33.3	37.2	32.3	35.7	34.1
A₄	82.1	75.5	83.3	79.2	79.5	B₄		167.6	163.6	170.5	165.4	168.7	C₄		115.7	120.6	116.4	115.8	114.3
A₅	183.5	188.6	190.3	185.3	181.7	B₅		210.2	214.3	207.9	205.6	212.5	C₅		544.4	542.5	542.7	543.9	545.2
A₆	323.2	325.6	320.9	319.7	329.5	B₆		244.2	241.6	249.5	244.4	242.8
						B₇		418.1	413.4	415.2	422.3	417.9
						B₈		597.2	603.2	596.4	595.8	594.3

区域	人工测量剥落面积		人工测量剥落面积
A1	0.0	B5	215.4
A2	19.4	B6	241.4
A3	0.0	B7	413.0
A4	79.0	B8	564.6
A5	182.6	C1	0.0
A6	309.4	C2	0.0
B1	55.2	C3	32.6
B2	89.4	C4	109.2
B3	100.6	C5	529.0
B4	159.2

区域	剥落面积/mm²		集料剥落质量/g	试件类型与颗粒标记
区域	激光	人工	集料剥落质量/g	试件类型与颗粒标记
1	19.66	19.40	5.50	A-2
2	34.52	32.60	9.70	C-3
3	52.46	55.20	4.80	B-1
4	79.92	79.00	6.90	A-4
5	97.32	89.40	7.20	B-2
6	102.38	100.60	9.00	B-3
7	116.56	109.20	12.40	C-4
8	167.16	159.20	8.30	B-4
9	185.88	182.60	14.70	A-5
10	210.10	215.40	10.60	B-5
11	244.50	241.40	15.20	B-6
12	323.78	309.40	21.20	A-6
13	417.38	413.00	18.00	B-7
14	543.74	529.00	38.20	C-5
15	597.38	564.60	25.30	B-8